My guess is that the command was before known as Move, and now it's Fly, and there's a wrong reference in the manual.
Fly and StopFly they do behave in console like the manual says.
Fly {Speed 100} starts moving the camera forward at 100 Pc/s, so except the term "Move" changed to "Fly", other command parameters seem unchanged.
Edit:
I see I reported this error in manual some time ago, I thought it was familiar. I'll correct the error in my PDF version of the manual, thanks for bringing this up.